Power Defender Variable Speed Pump 1.65 HP

Choosing the correct pool pump depends on pool size, plumbing size, and system features (heater, spa, water features, etc.). Bigger is not always better – an oversized pump wastes energy and can damage equipment.

Determine Your Pool Size

Rectangular Pool
Length × Width × Average Depth × 7.5 = Gallons

Round Pool
Diameter × Diameter × Average Depth × 5.9 = Gallons

Recommended Pump Size by Pool Volume

⚠️ Note: Modern variable-speed pumps often replace larger single-speed pumps at lower HP ratings due to higher efficiency.

Plumbing Size Matters (Very Important)

Oversizing a pump on small plumbing can cause:

• Excessive noise
• Poor filtration
• Heater & filter damage

Pump Type Comparison

Single-Speed Pumps

• Lower upfront cost
• Higher electricity usage
• Becoming obsolete in many states

Best for: Basic systems, budget replacements

Dual-Speed Pumps

• High & low speed operation
• Lower energy cost than single-speed

Best for: Simple upgrades where VS is not required

Variable-Speed Pumps (Recommended)

• Most energy efficient
• Quiet operation
• Programmable speeds
• Often utility rebate eligible

Best for: Nearly all residential pools

???? A 1.65–2.7 THP variable-speed pump can replace most 1 1/2 – 3 HP single-speed pumps.

Systems That Require a Larger Pump

You may need a larger pump if your pool has:

• Spa spillover
• Waterfalls or deck jets
• Solar heating
• In-floor cleaning system
• Long plumbing runs

Common Sizing Mistakes

❌ Choosing HP only (ignore flow & plumbing)
❌ Oversizing “just to be safe”
❌ Ignoring filter and heater flow limits

✅ Always size for flow rate (GPM), not just horsepower.

Still Not Sure?

If you’re replacing an existing pump, check the motor label for:

• HP
• THP (Total Horsepower)
• Voltage
• Plumbing size

If you’re unsure, contact us and we’ll help you choose the correct pump.